The user chooses the files or an entire folder to be processed before starting the conversion. There will be no audio quality loss during the conversion; the bit rate used to create the new MP3s will be the same as the bit rate of the original MP4s. Using this time saving software, even large numbers of files can be handled with one click. Convert music to mp3 free have a peek here: http://www.audio-transcoder.com/how-to-convert-m4b-files-to-mp3 express low m4b to mp3 turn_________________Free convert m4b to mp3: m4btomp3 find more information http://www.audio-transcoder.com